Development of an inspection system for surface corrosion of pipes covered with heat insulators by ac impedance method using rotating magnetic field

本研究开发了一种利用电磁现象检测保温层管道表面腐蚀的管道检测系统。为管道检测系统设计了产生旋转磁场的电磁铁，并验证了该电磁铁的性能。为提高管道表面腐蚀检测的准确性，对该频率下的阻抗测量条件进行了考察，找出了提高检测精度的特定频率。

In this study, a pipe inspection system using electromagnetic phenomenon for surface corrosion of pipes covered with heat insulators is developed. An electromagnet to produce a rotating magnetic field was created for the pipe inspection system ; it was confirmed to have an enough performance. To improve inspection accuracy of the surface corrosion of pipes, measurement conditions of impedance at the frequency were examined ; the specific frequencies to improve inspection accuracy were found.